A diesel engine breather

Abstract

A diesel engine respirator contains a diesel engine air inlet pipe, a crankcase, a connecting pipe; the connecting pipe is divided into two sections, which are A connecting pipe and B connecting pipe respectively; the upper end of the A connecting pipe is communicated with the air inlet pipe, and the lower end is communicated with the air outlet of an oil gas condensing device; the upper end of the B connecting pipe is communicated with the oil gas condensing device air inlet, and the lower end is communicated with the crankcase; the oil gas condensing device is a water-cooled heat exchanger, which is provided with a cooling water inlet and an outlet. The oil gas in the crankcase is introduced into the oil gas condensing device through the B connecting pipe, and after being condensed by the oil gas condensing device, on the one hand, the maximum oil gas capacity of the gas can be reduced when the hot oil gas meets the cold, on the other hand, the kinetic energy of the oil gas is reduced by cooling; so that more condensate oil is produced from the supersaturated oil gas, realizing the separation of gas and oil in the oil gas through the labyrinth cooling. Not only the environmental pollution of the crankcase gas is eliminated, but also the oil consumption rate of the diesel engine is reduced.

Description

[0001] This invention is a divisional application of the patent application with application number 2022102948234, application date March 24, 2022, and invention title "A diesel engine breather". Technical Field

[0002] This invention relates to a diesel engine breather, and more particularly to a breathing device for the crankcase of a fully enclosed lifeboat diesel engine, belonging to the field of diesel engine safety and environmental protection technology. Background Technology

[0003] During the operation of a diesel engine, gases generated by leakage from the piston and cylinder side clearance, stirring of lubricating oil by moving parts, and high-temperature evaporation of lubricating oil will accumulate over time, causing the pressure inside the crankcase to increase. If these gases cannot be released in time, in extreme cases, it may even cause the crankcase to explode. Therefore, the diesel engine crankcase must have a breathing function to keep the internal air pressure of the diesel engine crankcase balanced with the external atmospheric pressure.

[0004] Currently, diesel engine crankcase breathers are classified into two types according to their emission method. One type directly vents the gas in the diesel engine crankcase into the atmosphere, such as Patent No. 201720717497.8, titled "Diesel Engine Breather and Diesel Engine." This breather filters the gas in the crankcase through the filter filler 70 (i.e., steel wire mesh) at the exhaust filter port before directly venting it into the atmosphere. Because the exhaust filter port of the breather has a small volume and is located near the engine, it needs to withstand the heat radiation from the diesel engine. Therefore, the heat dissipation effect of the exhaust filter port of this breather is poor. In addition, the oil and gas pass through the steel wire mesh for a long time, causing the temperature of the steel wire mesh to rise continuously and approach the temperature of the oil and gas in the crankcase. In other words, the kinetic energy loss of the airflow when passing through the steel wire mesh is very small, resulting in poor oil condensation effect of the steel wire mesh. Most of the oil in the oil and gas is still discharged into the atmosphere along with the gas, which not only causes a large oil loss in the diesel engine but also pollutes the environment.

[0005] Another type of respirator condenses the gas in the diesel engine crankcase through a labyrinth at the intake port, then discharges it into the engine's intake manifold. The oil and gas then enter the combustion chamber for combustion before being released into the atmosphere. For example, patent number 201410128214.7, titled "A 360-degree tilting lifeboat diesel engine auxiliary respirator," describes a respirator where the intake port is located in the gear chamber and features a labyrinth at the intake port to separate the engine oil from the oil and gas. In practice, its oil condensation and pollution reduction effect is significant. This is also not ideal, because the intake labyrinth is located in the diesel engine gearbox and is connected to the crankcase. Therefore, the oil-gas temperature in the labyrinth is the same as that in the crankcase. In the same high-temperature environment, the kinetic energy loss of the oil-gas passing through the labyrinth is minimal, resulting in poor oil droplet condensation. Furthermore, the grilles in the labyrinth are arranged vertically, and for oil return, an oil return hole (422A) is located at the bottom of the lower grille. If the oil return hole (422A) is too small, the oil return will be obstructed, leading to oil condensation and splashing oil in the gearbox. Over time, the lower grille may become filled with engine oil, blocking the air passage and causing the breather to malfunction. If the oil return hole (422A) is too large, because the resistance of oil and gas passing through the oil return hole (422A) is less than that passing through the labyrinth, some of the oil and gas in the crankcase may bypass the labyrinth and be discharged directly from the oil return hole (422A), further worsening the labyrinth's oil solidification effect. High-temperature oil and gas enter the intake manifold through the pipeline. Due to the high molecular kinetic energy of high-temperature gas, the gas expands, resulting in a decrease in the number of moles of oxygen molecules per unit volume of the intake manifold compared to normal temperature, thus affecting the oxygen content of the diesel engine cylinder intake. However, under standard air pressure and temperature, the intake volume of the cylinder and the fuel supply to the combustion chamber of a diesel engine are optimally matched. If the oxygen content of the gas in the cylinder is reduced while the amount of engine oil in the oil and gas increases, it will inevitably lead to incomplete combustion of the diesel + engine oil mixture in the diesel engine combustion chamber, thus affecting the diesel engine's emissions, increasing environmental pollution, and also increasing the diesel engine's oil consumption.

[0006] In summary, current diesel engine breathers cannot effectively separate engine oil from the crankcase oil vapor during the oil vapor discharge process, thus failing to reduce diesel engine oil consumption and overcome its environmental pollution. Summary of the Invention

[0007] The purpose of this invention is to overcome the limitations of existing diesel engine breathers, which cannot effectively separate engine oil from the oil and gas during crankcase oil and gas discharge, thus reducing emissions. This invention achieves clean emissions by installing a filter device at the intake port of the diesel engine breather in the crankcase and then sending the filtered gas back into the oil and gas condensation device for condensation and separation of oil and gas.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions.

[0009] A diesel engine breather includes a diesel engine intake pipe, a crankcase, and a connecting pipe; characterized in that: the connecting pipe is divided into two sections, namely connecting pipe A and connecting pipe B; the upper end of connecting pipe A is connected to the intake pipe, and the lower end is connected to the outlet of an oil-gas condenser; the upper end of connecting pipe B is connected to the oil inlet and oil outlet of the oil-gas condenser, and the lower end is connected to the crankcase; the oil-gas condenser is a water-cooled heat exchanger, equipped with a cooling water inlet and outlet.

[0010] The objective of this invention can also be further achieved through the following technical solutions.

[0011] The lower end of the aforementioned B connecting pipe is connected to the crankcase, and an oil condensation screen is provided at its connection port.

[0012] The aforementioned oil-gas condensation device is equipped with a labyrinthine cooling water pipeline and an air passage that can pass through the cooling water pipeline, and is equipped with an oil inlet and an air outlet.

[0013] The aforementioned oil and gas condensation device comprises: a left end cover, a left isolation plate, a main body, a right isolation plate, and a right end cover, which are sequentially fixedly connected to the main body; the main body is a plenum, open on both sides; inside the plenum, from bottom to top on the front and rear sides, there are cantilevered grids of equal width to the left and right end faces of the main body, the total number of grids is odd, not less than three, and the front and rear grids are not connected to each other; the grids are tubular, with water channels running through them on both sides, and fins are provided on the lower surface of the grids;

[0014] The left and right partition plates are plate-shaped, and waterway holes are provided at positions corresponding to the waterways;

[0015] The lower part of the right end face of the left end cover is provided with a water inlet cavity, and the upper part of the water inlet cavity is provided with at least one connecting cavity; the water inlet cavity corresponds to the bottommost water channel hole on the left isolation plate; the connecting cavity starts from the second water channel hole below, and from bottom to top, each connecting cavity sequentially connects to two adjacent water channel holes on the left isolation plate; the water inlet cavity corresponds to the outside of the left end cover and is provided with a water inlet that communicates with the water inlet cavity;

[0016] The upper part of the left end face of the right end cover is provided with a water outlet cavity, and at least one connecting cavity is provided below the water outlet cavity; the water outlet cavity corresponds to the uppermost water channel hole on the right partition plate; the connecting cavity starts from the second water channel hole above, and from top to bottom, each connecting cavity sequentially connects to two adjacent water channel holes on the right partition plate; the water outlet cavity corresponds to the outside of the right end cover and is provided with a water outlet that communicates with the water outlet cavity.

[0017] The lower end of the body is provided with an air inlet and an oil return port, and the upper end of the body is provided with an air outlet. Both the air inlet and the oil return port and the air outlet are connected to the plenum of the body.

[0018] The aforementioned body is square-shaped, with both the outer shape and the box opening being square, and the box opening having equal width on all four sides; a flat plate extends upward from the rear of the square-shaped body, and is provided with mounting holes.

[0019] The aforementioned grid plates on the front and rear surfaces inside the plenum are alternately inserted downwards and forwards at the cantilever ends, with the left and right end faces flush with the end face of the plenum.

[0020] The fins of the aforementioned grid plate have the same width on the left and right as the grid plate, and the gaps between each fin on the lower plane of the upper grid plate and the upper plane of the lower grid plate are uneven.

[0021] The aforementioned body has three grid plates at the front and two grid plates at the rear inside the plenum. The grid plates, from bottom to top, are respectively named: first grid plate, second grid plate, third grid plate, fourth grid plate, and fifth grid plate, and their corresponding water channels are respectively named: first water channel, second water channel, third water channel, fourth water channel, and fifth water channel. The air outlet and the air inlet and oil return outlet are respectively located in the middle of the upper and lower surfaces of the square plenum.

[0022] The number, shape, and position of the water channels on the left and right partition plates mentioned above correspond to the water channels on the main body; the names of the water channels from bottom to top are respectively: first water channel, second water channel, third water channel, fourth water channel, and fifth water channel.

[0023] The aforementioned left end cap is groove-shaped, with the groove opening corresponding to the left isolation plate. Two horizontal partitions, level with the groove opening, are installed inside the groove, dividing the groove shape of the left end cap into three water cavities, defined from bottom to top as: the water inlet cavity, the second connecting cavity, and the fourth connecting cavity. The water inlet cavity corresponds to the first water channel hole of the left isolation plate; the second connecting cavity corresponds to the second and third water channel holes of the left isolation plate; and the fourth connecting cavity corresponds to the fourth and fifth water channel holes of the left isolation plate.

[0024] The aforementioned right end cap is groove-shaped, with the groove opening corresponding to the right partition plate. Inside the groove, there are two horizontal partition plates with a height level with the groove opening, dividing the groove shape of the right end cap into three water cavities, defined from top to bottom as: water outlet cavity, third connecting cavity, and first connecting cavity; the water outlet cavity corresponds to the fifth water channel hole of the right partition plate; the third connecting cavity corresponds to the fourth and third water channel holes of the right partition plate; and the first connecting cavity corresponds to the second and first water channel holes of the right partition plate.

[0025] Within the aforementioned body, the water channels of two adjacent upper and lower grid plates are spaced equally in the height direction, and the adjacent water channels are separated by at least the height gap of a transverse partition on an end cap in the height direction; the distance from the highest point of the lowest water channel (i.e., the first water channel) to the lower edge of the body cavity is equal to the distance from the lowest point of the highest water channel (i.e., the fifth water channel) to the upper edge of the body cavity.

[0026] The waterway described above has a cross-section that is an elongated waist-shaped hole or a set of holes.

[0027] The left and right end caps described above are identical in shape and size and are interchangeable.

[0028] The aforementioned left end cover, left partition plate, body, right partition plate, and right end cover; a left end cover gasket is provided between the left end cover and the left partition plate, a left body gasket is provided between the left partition plate and the body, a right body gasket is provided between the body and the right partition plate, and a right end cover gasket is provided between the right partition plate and the right end cover.

[0029] The left and right end cap pads mentioned above have the same shape and size as the mating surfaces of the left and right end caps and are interchangeable.

[0030] The left and right body pads mentioned above have the same shape and size as the end face of the body and are interchangeable.

[0031] The air outlet and the air inlet / oil return port mentioned above are respectively described above. The air outlet protrudes from the upper plane of the cavity of the main body, while the air inlet / oil return port does not protrude from the lower plane of the cavity of the main body.

[0032] The upper end of the aforementioned A connecting pipe is connected to the intake pipe, and includes the A connecting pipe, the A hinge body, the hinge screw, the A combination gasket, the B combination gasket, and the intake pipe; the A connecting pipe and the A hinge body are welded together, and the A hinge body is connected to the intake pipe by using the hinge screw, the A combination gasket, and the B combination gasket.

[0033] The lower end of the aforementioned A connecting pipe is connected to the outlet of the oil-gas condenser by using the A clamp on the A connecting pipe to connect to the outlet pipe connector on the oil-gas condenser.

[0034] The upper end of the aforementioned B connecting pipe is connected to the inlet and outlet of the oil-gas condensing device by means of the B clamp on the B connecting pipe and the inlet and outlet pipe joint on the oil-gas condensing device.

[0035] The lower end of the aforementioned B connecting pipe is connected to the crankcase and includes the B connecting pipe, B hinge body, hinge sleeve, cap nut, C combination gasket, D combination gasket, advance advance cover, and oil condensation screen. The B connecting pipe is fixedly connected to the B hinge body. The hinge sleeve has an axial thread on its left end and a flange on its right end, with an axial blind hole in the middle of its right end face and a radial through hole at the bottom of the blind hole. The size and position of the radial through hole are adapted to the B hinge body. The left end of the hinge sleeve passes sequentially from left to right through the advance advance cover, D combination gasket, B hinge body, and C combination gasket, and is fixedly connected with a cap nut. An oil condensation screen is fixedly connected to the right end face of the hinge sleeve.

[0036] The aforementioned oil-condensing mesh cover is butterfly-shaped.

[0037] Advantages and beneficial effects of the present invention:

[0038] This invention introduces the oil and gas in the crankcase into an oil and gas condensation device via a B-connecting pipe. After condensation, the oil and gas in the crankcase are cooled. Simultaneously, the hot oil and gas rapidly lose kinetic energy upon cooling, causing the engine oil within to quickly precipitate from the grid plates of the engine body. Since the grid plates are inclined downwards, the precipitated oil falls freely under gravity and flows back to the diesel engine oil pan through the intake oil return pipe. This achieves the separation of gas and oil in the oil and gas mixture through a labyrinth cooling process. This purifies the crankcase gases, eliminating environmental pollution and reducing the diesel engine's oil consumption rate, thus lowering operating costs.

[0039] The front and rear grids inside the main body are both inclined downwards. The grids are alternately interspersed from bottom to top and do not stick together, which increases the travel distance of high-temperature oil and gas in the labyrinth. Below each grid, there are also fins, which not only increase the heat exchange area between the oil and gas and the radiator, but also slow down the flow speed of the oil and gas in the labyrinth, further improving the condensation effect and making the oil and gas separation more thorough and clean.

[0040] In this invention, the gaps between the fins on the lower plane of the upper grid plate and the upper plane of the lower grid plate are uneven. When the crankcase gas passes through the oil-gas condenser from bottom to top, the temperature decreases as it reaches the upper layer. Since the density of the cold air in the upper layer is greater than that of the hot air in the lower layer, the cold air will sink. By changing the gaps between the fins of the upper grid plate and the lower grid plate, the upward airflow continuously expands, compresses, expands again, and compresses again, thereby continuously changing the air pressure of the upper and lower airflows. This results in the lower air pressure being higher than the upper air pressure, meaning that the upward airflow is obstructed and the air pressure increases. When the sinking cold air encounters a small gap, it will be pushed upward by the high-pressure gas in the lower layer until it reaches the diesel engine intake pipe, improving the cooling effect of the oil-gas condenser. At the same time, during this process, the convection of the hot and cold airflows increases the collision between tiny droplets in the airflow, causing them to condense into larger droplets that fall onto the grid plate, further improving the oil-gas separation effect.

[0041] To achieve the desired cooling water flow within the main body, which oscillates left and right upwards—that is, flows alternately upwards through the water channel holes in the left and right grid plates—and improve the condensation effect on oil and gas, it is necessary to solve the problem of connecting the water channels between two adjacent grid plates on the upper and lower sides of the main body. This invention uses left and right isolation plates and corresponding water channel holes to isolate the left and right end caps from the main body, simultaneously separating the air passages and water channels. A closed air passage is formed within the main body, where oil and gas enter through the air inlet and oil return holes, travel through the gaps between the front and rear grid plates, and then flow out through the air outlet. The water channel holes on the left and right isolation plates are connected through different connecting cavities on the left and right end caps, achieving the series connection of adjacent water channels on the upper and lower sides of the main body: water flows from the inlet—inlet cavity—first water channel—first connecting cavity—second water channel—second connecting cavity—third water channel—third connecting cavity—fourth water channel—fourth connecting cavity—fifth water channel—outlet cavity—outlet. Furthermore, when the water flows through the connecting cavities on the left and right end caps, the end caps can also dissipate heat from the water flow, further improving the condensation effect of the main body.

[0042] This invention utilizes left and right isolation plates and end cap connecting cavities to connect two irregularly shaped, differently oriented water channels that are very close to each other. Compared with the traditional method of connecting water channels through pipes or flanges, this invention not only greatly reduces the difficulty of water channel installation and connection, but also simplifies the product manufacturing process. At the same time, since the contact area between the cooling water and the end cap is large, the end cap can also dissipate heat from the cooling water, which can further improve the heat exchange effect of the main body.

[0043] The diesel engine gear chamber and crankcase are connected. The advance advance cover is installed on the gear chamber. This invention installs the crankcase breather outlet inside the advance advance cover and sets an oil condensation screen on the outlet. The purpose is to allow larger oil droplets in the oil-gas mixture inside the crankcase to be captured and condensed by the oil condensation screen, and then fall back into the oil pan. The oil condensation screen is butterfly-shaped. On the one hand, this is to shorten the axial dimension of the oil condensation screen and increase its radial dimension. By using a smaller axial space, a relatively larger crankcase breather outlet size can be obtained, which can make the mesh of the oil condensation screen smaller and the oil condensation effect better. On the other hand, the butterfly shape of the oil condensation screen is installed vertically. Under the action of gravity, the external oil droplets can slide off quickly after adhering, and the internal oil can quickly accumulate and seep out.

[0044] The advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings. Attached Figure Description

[0045] Figure 1 This is an assembly drawing of a diesel engine breather;

[0046] Figure 2 View AA of the oil and gas condensation unit;

[0047] Figure 3 Left view of the oil and gas condenser after removing the left end cover 1 and the left isolation plate 3;

[0048] Figure 4 This is a common front view for left partition 3 and right partition 7;

[0049] Figure 5 Front view of the left end cover 1;

[0050] Figure 6 BB view of an even-numbered grid plate oil-gas condenser;

[0051] Figure 7 Left view of the even-numbered grid plate oil-gas condenser after removing the left end cover 1 and the left isolation plate 3;

[0052] Figure 8 The left isolation plate 3 and the right isolation plate 7 of the even-numbered grid plates share a common front view;

[0053] Figure 9 This is an assembly drawing of a direct-flow diesel engine breather.

[0054] In the diagram: 1. Left end cap; 11. First screw; 12. Water inlet; 13. Water inlet chamber; 14. First transverse partition; 15. Second connecting chamber; 16. Second transverse partition; 17. Fourth connecting chamber; 2. Left end cap gasket; 3. Left partition plate; 31. First water channel hole; 32. Second water channel hole; 33. Third water channel hole; 34. Fourth water channel hole; 35. Fifth water channel hole; 36. Fixing hole; 4. Left body gasket; 5. Body; 51. Air inlet / oil outlet; 52. Air outlet; 53. Mounting hole; 54. Hole hole; 500. 501, First grid plate, 502, Second grid plate, 503, Third grid plate, 504, Fourth grid plate, 505, Fifth grid plate, 511, First water channel, 512, Second water channel, 513, Third water channel, 514, Fourth water channel, 515, Fifth water channel, 6, Body pad, 7, Right partition plate, 8, Right end cover pad, 9, Right end cover, 91, Second screw, 92, Water outlet, 93, Water outlet cavity, 94, Third transverse partition plate, 95, Third connecting cavity, 96, Fourth transverse partition plate, 97, First connecting cavity;

[0055] 100. Oil-gas condenser, 200. Inlet pipe, 300. Advance valve cover, 400. Crankcase, 301. Hinge sleeve, 302. Oil condensation screen, 511. B ferrule, 512. B connecting pipe, 513. B hinge body, 514. Cap nut, 515. C combination gasket, 516. D combination gasket, 521. A ferrule, 522. A connecting pipe, 523. A hinge body, 524. Hinge screw, 525. B combination gasket, 526. A combination gasket. Detailed Implementation

[0056] To make the objectives and technical solutions of this invention clearer, the invention will be further described below with reference to the accompanying drawings and embodiments:

[0057] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0058] In this invention, "left," "right," "up," "down," "front," and "back" refer to the positions of the reader directly facing the appendix. Figure 1 When reading, the left side of the reader is called left, the right side of the reader is called right, the top of the reader is called top, the bottom of the reader is called bottom, the side of the paper in front of the reader is called front, and the side directly in front of the reader is called back, which is not a specific limitation of the present invention.

[0059] In this invention, the term "connection" can mean either a direct connection between components or an indirect connection between components through other components.

[0060] Embodiment 1 of the present invention:

[0061] like Figure 1 As shown, a diesel engine breather includes a diesel engine intake pipe 200, an oil-gas condenser 100, and a crankcase 400; the intake pipe 200 and the oil-gas condenser 100 are connected by a connecting pipe A 522; and the oil-gas condenser 100 is connected to the crankcase 400 by a connecting pipe B 512.

[0062] The intake pipe 200 and the oil-gas condenser 100 are connected by connecting pipe A 522. Specifically, the upper end of connecting pipe A 522 is welded to hinge body A 523, and hinge screws 524, A combination washer 526, and B combination washer 525 are used to fix hinge body A 523 to the intake pipe 200. The lower end of connecting pipe A 522 has a retaining sleeve A 521 and a flared end, which connects to the outlet 52 of the oil-gas condenser 100. The outlet 52 is a hexagonal external threaded pipe fitting, and connecting pipe A 522 is a metal pipe.

[0063] The oil-gas condenser 100 is connected to the crankcase 400 via the B connecting pipe 512. Specifically, the upper end of the B connecting pipe 512 is provided with a B ferrule 511 and a flared mouth, which is fixedly connected to the air inlet and oil return port 51 of the oil-gas condenser 100. The air inlet and oil return port 51 is a hexagonal external thread pipe fitting, and the B connecting pipe 512 is a metal pipe. The lower end of the B connecting pipe 512 is connected to the crankcase 400, that is, the lower end of the B connecting pipe 512 is welded to the B hinge body 513; the left end of the hinge thread sleeve 301 is axially threaded, the right end is flanged, and the middle of the right end face is provided with an axial blind hole, and the bottom of the blind hole is provided with a radial through hole, the size and position of the radial through hole being adapted to the B hinge body 513; the left end of the hinge thread sleeve 301 passes through the advance cover 300, the D combination gasket 516, the B hinge body 513, and the C combination gasket 515 in sequence from left to right, and is fixed with a cap nut 514; a butterfly-shaped oil condensation screen 302 is fixedly connected to the right end face of the hinge thread sleeve 301, and the inside of the oil condensation screen 302 is provided with a butterfly-shaped steel wire skeleton. In this embodiment, the connection method between the hinge thread sleeve 301 and the oil condensation screen 302 is preferably welding.

[0064] The diesel engine gear chamber and crankcase are connected. The advance cover 300 is installed on the gear chamber cover. Therefore, in this embodiment, the internal space of the advance cover 300 is interconnected with the space of the crankcase 400. Therefore, in this embodiment, the air outlet of the crankcase 400 breather, namely the oil condensation screen 302, is installed inside the advance cover 300. The oil condensation screen 302 is installed so that larger oil droplets in the oil-gas mixture inside the crankcase 400 can be captured and condensed by the oil condensation screen 302 and fall back into the oil pan. The oil condensation screen 302 adopts a butterfly-shaped design. On the one hand, it shortens the axial dimension of the oil condensation screen 302 and expands the radial dimension of the oil condensation screen 302. By utilizing a smaller axial space, a relatively larger air outlet size of the crankcase 400 breather can be obtained, which can make the mesh size of the oil condensation screen 302 smaller and the oil condensation effect better. On the other hand, the butterfly shape of the oil condensation screen 302 is installed vertically. Under the action of gravity, the external oil droplets can slide off quickly after they are attached, and the internal oil can quickly accumulate and seep out.

[0065] Figure 2 As shown, the oil and gas condensation device includes a left end cover 1, a left end cover gasket 2, a left isolation plate 3, a left body gasket 4, a body 5, a right body gasket 6, a right isolation plate 7, a right end cover gasket 8, and a right end cover 9. The left end cover 1, the left end cover gasket 2, the left isolation plate 3, and the left body gasket 4 are fixed to the left end face of the body 5 by a first screw 11, and the right end cover 9, the right end cover gasket 8, the right isolation plate 7, and the right body gasket 6 are fixed to the right end face of the body 5 by a second screw 91.

[0066] In this embodiment, the shapes and dimensions of the left end cap gasket 2 and the right end cap gasket 8 correspond to the groove end faces of the left end cap 1 and the right end cap 9, respectively. They are made of rubber. The left end cap gasket 2 seals the space between the left end cap 1 and the left partition plate 3, and the right end cap gasket 8 seals the space between the right end cap 9 and the right partition plate 7. The shapes and dimensions of the left body gasket 4 and the right body gasket 6 correspond to the left and right end faces of the body 5, respectively. They are also made of rubber. The left body gasket 4 seals the space between the body 5 and the left partition plate 3, and the right body gasket 6 seals the space between the body 5 and the right partition plate 7.

[0067] The main body 5 is box-shaped, open on both sides, and both its outer shape and the box opening 54 are square, with the box opening 54 having a uniform width on all four sides. A flat plate extends upward from the rear of the box shape, with a mounting hole 53. Inside the box opening 54, on the front and back surfaces, there are a total of 5 downward-sloping grid plates (501-505), meaning that the total number of grid plates (501-505) is odd. The grid plates (501-505) alternate sequentially from bottom to top, and between the front and back grid plates (501-505), without intersecting. The grid plates (501-505) are square in cross-section. Below each grid plate, there are multiple fins 500 of varying heights in the front and back directions. The width of the fins 500 is equal to that of the grid plate. The gaps between the fins on the lower plane of the upper grid plate and the upper plane of the lower grid plate are uneven. This not only increases the heat exchange area between the oil and gas and the radiator, but also slows down the flow speed of the oil and gas in the labyrinth, further improving the condensation effect and making the oil and gas separation more thorough and clean.

[0068] The left and right length is 3 / 4 of the width of the plenum 54. The left and right end faces are flush with the end faces of the plenum 54. The ends of the plenum plates are rounded vertically, and the downward tilt angle of the plenum plates is 15°. There is a gap between the upper and lower adjacent plenum plates (501-505) to provide a gas passage for crankcase oil-gas condensation. Inside the plenum 54, the plenum plates (501, 503, 505) are connected to the front of the plenum 54 and are respectively labeled as: first plenum plate 501, third plenum plate 503, and fifth plenum plate 505; the plenum plates (502, 504) are connected to the rear of the plenum 54 and are respectively labeled as: second plenum plate 502. The fourth grid plate 504; on the left and right end faces of the grid plate, along the axis of the funnel hole 54, there are water channels (511-515) that run through the left and right sides, and the water channels (511-515) are waist-shaped; the water channels (511-515) corresponding to the grid plates (501-505) are respectively named: first water channel 511, second water channel 512, third water channel 513, fourth water channel 514, and fifth water channel 515; the air outlet 52 and the air inlet and oil return outlet 51 are respectively set in the middle of the upper and lower surfaces of the funnel hole 54 of the body 5; the inner diameter of the air inlet and oil return outlet 51 is Φ12-Φ16 mm, and the inner diameter of the air outlet 52 is Φ8 mm.

[0069] like Figure 4As shown, the left partition plate 3 and the right partition plate 7 are both square stainless steel plates, 2 mm thick, with the same length and width dimensions as the left and right end faces of the main body 5. The left partition plate 3 and the right partition plate 7 are provided with water channel holes (31-35) and fixing holes 36. The number, shape, and position of the water channel holes (31-35) correspond to the water channels on the main body 5. The water channel holes are named from bottom to top as: first water channel hole 31, second water channel hole 32, third water channel hole 33, fourth water channel hole 34, and fifth water channel hole 35. The first water channel hole 31 corresponds to the first water channel 511, and so on, with the fifth water channel hole 35 corresponding to the fifth water channel 515. The left partition plate 3 is installed between the main body 5 and the left end cover 1, and the right partition plate 7 is installed between the main body 5 and the right end cover 9.

[0070] like Figure 2 As shown, the main body 5 is separated from the left end cover 1 and the right end cover 9 by the left isolation plate 3 and the right isolation plate 7. The water channel in the main body 5 is connected to the slot on the end cover, so that the oil-gas condensation device forms two mutually sealed passages, namely the crankcase oil-gas condensation passage and the cooling water passage.

[0071] like Figure 2 , Figure 3 As shown, through the reasonable layout of the grid plates of the main body 5, the spacing between the water channels of two adjacent grid plates in the vertical direction is equal, and at least one height gap of the first transverse partition 14 on the end cap is maintained between adjacent water channels in the vertical direction. Furthermore, the distance from the highest point of the first water channel 511 to the lower edge of the main body is equal to the distance from the lowest point of the fifth water channel 515 to the upper edge of the main body. This satisfies the requirement that the shape, position, and size of the left end cap 1 are identical to those of the right end cap 9 when reversed, making the left end cap 1 and the right end cap 9 interchangeable and reducing production costs. Since the left end cap 1 and the right end cap 9 have different functions and uses, this application still describes the left end cap 1 and the right end cap 9 separately.

[0072] like Figure 2 , Figure 5 As shown, the left end cover 1 is groove-shaped, with the groove opening corresponding to the left isolation plate 3. Two horizontal partitions, level with the groove opening, are provided inside the groove, namely the first horizontal partition 14 and the second horizontal partition 16, dividing the groove shape of the left end cover into three water cavities, defined from bottom to top as: water inlet cavity 13, second connecting cavity 15, and fourth connecting cavity 17. The back of the water inlet cavity 13 has a water inlet 12, which communicates with the water inlet cavity 13. The front of the water inlet cavity 13 corresponds to the first water channel hole 31 of the left isolation plate 3. The second connecting cavity 15 corresponds to the second water channel hole 32 and the third water channel hole 33 of the left isolation plate 3. The fourth connecting cavity 17 corresponds to the fourth water channel hole 34 and the fifth water channel hole 35 of the left isolation plate 3.

[0073] like Figure 1As shown, the right end cover 9 is groove-shaped, with the groove opening corresponding to the right partition plate 7. Two horizontal partitions, level with the groove opening, are provided inside the groove: the third horizontal partition 94 and the fourth horizontal partition 96. These divide the groove of the right end cover 9 into three water cavities, defined from top to bottom as: water outlet cavity 93, the third connecting cavity 95, and the first connecting cavity 97. The back of the water outlet cavity 93 has a water outlet 92, which communicates with the water outlet cavity 93. The front of the water outlet cavity 93 corresponds to the fifth water channel hole 515 of the right partition plate 7. The third connecting cavity 95 corresponds to the fourth water channel hole 514 and the third water channel hole 513 of the right partition plate 7. The first connecting cavity 97 corresponds to the second water channel hole 512 and the first water channel hole 511 of the right partition plate 7.

[0074] The device has an inlet 12 at the lower center of the left end cover 1 and an outlet 92 at the upper center of the right end cover 9. The cooling water path for condensing crankcase oil and gas is as follows: Cooling water flows in from the inlet 12 into the inlet chamber 13, the first water channel 511, the first connecting chamber 97, the second water channel 512, the second connecting chamber 15, the third water channel 513, the third connecting chamber 95, the fourth water channel 514, the fourth connecting chamber 17, the fifth water channel 515, the outlet chamber 93, and flows out to the outlet 92.

[0075] The upper end of the body 5 is provided with an air outlet 52 that protrudes downward from the upper surface of the inner hole 54 of the body 5, and the lower end is provided with an air inlet and oil return port 51 that does not protrude from the lower surface of the inner hole 54 of the body 5. The crankcase oil and gas enter the inner hole 54 of the body 5 through the air inlet and oil return port 51, bypass the first grid plate 501, the gap between the first grid plate 501 and the second grid plate 502, the gap between the second grid plate 502 and the third grid plate 503, the gap between the third grid plate 503 and the fourth grid plate 504, the gap between the fourth grid plate 504 and the fifth grid plate 505, the upper part of the inner hole 54 of the body 5, and the air outlet 52 to discharge the condensed clean gas. The condensed clean gas is discharged into the intake pipe of the diesel engine. Since the fifth grid plate 505 to the first grid plate 501 are all downward-sloping cantilever beams, the oil condensed and precipitated by the grid plates will gradually slide down the surface of the grid plates under the action of gravity and flow into the intake oil return hole 51. Since the device is installed on the body of the diesel engine, the position of its intake oil return hole 51 is higher than the oil pan of the diesel engine. Therefore, the oil flowing into the intake oil return hole 51 will eventually flow into the oil pan of the diesel engine.

[0076] In this embodiment, there are a total of 5 grid plates, i.e., 5 water channels, an odd number. The water inlet is located at the lower end of the left end cover, and the water outlet is located at the upper end of the right end cover. Since this invention adopts a symmetrical design, the left and right end covers can also be swapped, so that the water inlet is located at the lower end of the right end cover and the water outlet is located at the upper end of the left end cover. The purpose of this arrangement is twofold: first, to distribute the water inlet and outlet on the left and right sides of the main body; second, to achieve not only water inlet at the lower left and water outlet at the upper right, but also water inlet at the lower right and water outlet at the upper left; and to fully utilize the flexibility of pipe installation, so as to better adapt to the requirements of different diesel engines for the routing of cooling water pipes, and effectively avoid interference with the position of other components on the diesel engine when the device is installed on different diesel engines.

[0077] Embodiment 2 of the present invention:

[0078] Other settings are the same as in Embodiment 1 of the present invention.

[0079] In this embodiment, the total number of grid plates inside the main body cavity is even, with at least four grid plates provided.

[0080] The main body has two grid plates at the front and two grid plates at the rear inside the plenum. The grid plates are labeled as the first grid plate, the second grid plate, the third grid plate, and the fourth grid plate from bottom to top, and the corresponding water channels are labeled as the first water channel, the second water channel, the third water channel, and the fourth water channel, respectively.

[0081] The number, shape, and position of the water channels on the left and right partition plates correspond to the water channels on the main body; the names of the water channels from bottom to top are respectively: first water channel, second water channel, third water channel, and fourth water channel.

[0082] The lower part of the right end face of the left end cover is provided with a water inlet cavity, which corresponds to the lowest water channel hole on the left isolation plate. The upper part of the water inlet cavity is provided with at least one connecting cavity, which connects to two adjacent water channel holes on the left isolation plate from bottom to top, starting from the second to last water channel hole on the left isolation plate. The upper part of the right end face of the left end cover is provided with a water outlet cavity, which corresponds to the highest water channel hole on the left isolation plate. The water outlet cavity corresponds to the outside of the left end cover and is provided with a water outlet that communicates with the water outlet cavity.

[0083] On the left end face of the right end cover, there are at least two communicating cavities that connect sequentially from top to bottom to two adjacent water channel holes on the right isolation plate.

[0084] like Figure 6 , Figure 7 , Figure 8As shown, in this embodiment, the total number of grid plates (501-504) is an even number, totaling 4. The inlet 12 and outlet 92 are both on the left end cover 1. On the right end face of the left end cover 1, the bottom of the lower end is provided with an inlet cavity 13, which corresponds to the bottommost water channel hole 31 of the left isolation plate 3. The bottom of the upper end is provided with an outlet cavity 18, which corresponds to the topmost water channel hole 34 of the left isolation plate 3. On the left side of the left end cover 1, the inlet 12 is provided at the position of the inlet cavity 13, and the inlet 12 is connected to the inlet cavity 13. The outlet 92 is provided at the position of the outlet cavity 18, and the outlet 92 is connected to the outlet cavity 18. Between the inlet cavity 13 and the outlet cavity 18, there is a connecting cavity 15, which corresponds to the water channel hole 32 and the water channel hole 33 of the left isolation plate 3.

[0085] On the left end face of the right end cover 9, there are two connecting cavities, namely the third connecting cavity 95 and the first connecting cavity 97; the third connecting cavity 95 corresponds to the first water channel hole 31 and the second water channel hole 32 on the right isolation plate 7, and the first connecting cavity 97 corresponds to the third water channel hole 33 and the fourth water channel hole 34 on the right isolation plate 7.

[0086] Since the left and right ends of the main body 5 are symmetrically designed, the left end cover 1 and the right end cover 9 can be interchanged. That is to say, the water inlet 12 and the water outlet 92 of this embodiment can be on the left side of the oil-gas condensing device at the same time; or on the right side of the oil-gas condensing device at the same time. The flexibility of the cooling water pipeline installation is fully utilized, thereby further adapting to the routing requirements of different diesel engines for the cooling water pipeline, and effectively avoiding interference with the position of other components on the diesel engine when the device is installed on different diesel engines.

[0087] Embodiment 3 of the present invention:

[0088] Other settings are the same as in Embodiment 1 of the present invention.

[0089] A diesel engine breather includes a diesel engine crankcase, a B-connecting pipe, and an oil-gas condensing device; characterized in that: the lower end of the B-connecting pipe is connected to the crankcase, and the upper end is connected to the oil inlet and oil outlet of the oil-gas condensing device, and the upper outlet of the oil-gas condensing device is connected to the atmosphere; the oil-gas condensing device is a water-cooled heat exchanger, and is provided with a cooling water inlet and an outlet.

[0090] like Figure 9 As shown, a diesel engine breather has a B connecting pipe 512 whose lower end is connected to the crankcase 400 via an oil condenser screen 302, and whose upper end is connected to the inlet and outlet ports 51 of an oil-gas condensation device 100. The oil-gas condensation device 100 is a water-cooled heat exchanger with a cooling water inlet 12 and an outlet 12. The outlet port 52 of the oil-gas condensation device 100 is directly connected to the atmosphere, so that the oil and gas in the crankcase are separated by the oil condenser screen and the oil-gas condensation device, and the clean gas is directly discharged into the atmosphere.

Claims

1. A diesel engine breather, comprising a diesel engine intake pipe, a crankcase, and a connecting pipe; characterized in that: The connecting pipe is divided into two sections, namely connecting pipe A and connecting pipe B; the upper end of connecting pipe A is connected to the air inlet pipe and the lower end is connected to the air outlet of the oil-gas condenser; the upper end of connecting pipe B is connected to the air inlet and oil return port of the oil-gas condenser and the lower end is connected to the crankcase; the oil-gas condenser is a water-cooled heat exchanger, which is equipped with a cooling water inlet and an outlet. The oil and gas condensation device includes: a left end cover, a left isolation plate, a main body, a right isolation plate, and a right end cover, which are fixedly connected to the main body in sequence; the main body is a lattice hole that is open on both sides; inside the lattice hole, from bottom to top on the front and rear sides, there are cantilevered grids with the same width as the left and right end faces of the main body, the total number of grids is even, not less than four, and the front and rear grids are not connected to each other; the grids are tubular, with water channels running through them on both sides, and fins are provided on the lower surface of the grids; The left and right partition plates are plate-shaped, and waterway holes are provided at positions corresponding to the waterways; The lower part of the right end face of the left end cover is provided with a water inlet cavity, and the upper part of the water inlet cavity is provided with at least one connecting cavity; the water inlet cavity corresponds to the bottommost water channel hole on the left isolation plate; the connecting cavity, starting from the second water channel hole below, connects sequentially to two adjacent water channel holes on the left isolation plate from bottom to top; the water inlet cavity corresponds to the outside of the left end cover and is provided with a water inlet connected to the water inlet cavity; the upper part of the right end face of the left end cover is provided with a water outlet cavity, which corresponds to the topmost water channel hole on the left isolation plate; the water outlet cavity corresponds to the outside of the left end cover and is provided with a water outlet connected to the water outlet cavity. On the left end face of the right end cover, there are at least two communicating cavities; from top to bottom, they are sequentially connected to two adjacent water channel holes on the right partition plate. The lower end of the body is provided with an air inlet and an oil return port, and the upper end of the body is provided with an air outlet. Both the air inlet and the oil return port and the air outlet are connected to the plenum of the body.

2. A diesel engine breather according to claim 1, characterized in that: The lower end of the B connecting pipe is connected to the crankcase, and an oil condensation screen is provided at its connection port.

3. A diesel engine breather according to claim 2, characterized in that: The oil-condensing mesh cover is butterfly-shaped.

4. A diesel engine breather according to claim 1, characterized in that: The oil-gas condensation device is equipped with a labyrinthine cooling water pipeline and an air passage that can pass through the cooling water pipeline, and is equipped with an air outlet and an air inlet / oil return outlet.

5. A diesel engine breather according to claim 1, characterized in that: The main body is square, with both the outer shape and the box opening being square, and the box opening having equal width on all four sides; a flat plate extends upward from the rear of the square box shape, and is provided with mounting holes.

6. A diesel engine breather according to claim 1, characterized in that: Inside the plenum, the grid plates on the front and rear surfaces are alternately inserted downwards and forwards at the cantilever ends, with the left and right end faces flush with the end face of the plenum.

7. A diesel engine breather according to claim 1, characterized in that: The fins of the grid plate have the same width on the left and right as the grid plate, and the gaps between each fin on the lower plane of the upper grid plate and the upper plane of the lower grid plate are uneven.

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